Furnace having a normally closed blower relay

Details Furnace having a normally closed blower relay Furnace having a normally closed blower relay

1977-10-31

1980-02-19

Wayner, William E.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

361 37, 417 12, F24D 500

Patent

active

041890914

ABSTRACT:
A furnace having a burner fired heat exchanger with a flue gas passage and a heated air passage, a blower powered by an electric motor for circulating the heated air and an electric control circuit with a normally closed relay connecting the blower motor to the power source, the relay being controlled by a "Schmitt trigger" connected to a timing combination.

REFERENCES:
patent: 2467425 (1949-04-01), Cobb
patent: 2615634 (1952-10-01), Harbin, Jr.
patent: 2656111 (1953-10-01), Lehane et al.
patent: 2704571 (1955-03-01), Peicheldefer
patent: 2801055 (1957-07-01), Seifert
patent: 2862666 (1958-12-01), Kriechbaum
patent: 3223325 (1965-12-01), Letourneau
patent: 3544003 (1970-12-01), Bisaell, Jr.
patent: 3587558 (1971-06-01), Raleigh
patent: 3664414 (1972-05-01), Raleigh
patent: 3776214 (1973-12-01), Coffman
patent: 4055297 (1977-10-01), Lee

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